Siemens MICROMASTER 440 Operating Instructions Manual

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Issue 10/03 2 InstallationMICROMASTER 440 Operating Instructions6SE6400-5AW00-0BP0 352.4.2 Power and motor connectionsWARNINGThe inverter must always be grounded.♦ Isolate the mains electrical supply before making or changing connections tothe unit.♦ Ensure that the inverter is configured for the correct supply voltage:MICROMASTERS must not be connected to a higher voltage supply.♦ When synchronous motors are connected or when coupling several motors inparallel, the inverter must be operated with V/f control characteristic (P1300 =0, 2 or 3).CAUTIONAfter connecting the power and motor cables to the proper terminals, make surethat the front covers have been replaced properly before supplying power to theunit!NOTICE♦ Ensure that the appropriate circuit-breakers/fuses with the specified currentrating are connected between the power supply and inverter (see chapter 5,Tables 5-5).♦ Use Class 1 60/75 oC copper wire only (for UL compliance). For tighteningtorque see Table 5-2.Access to the power and motor terminalsAccess to the power supply and motor terminals is possible by removing the frontcovers (See Fig. 2-8 to Fig. 2-10). See also Appendix B.After removing the front covers and exposing the terminals, complete power andmotor connections as shown in Fig. 2-11.Connection of braking unit (only for framesize FX and GX)A passage opening for access to the intermediate circuit connections has beenprovided on the top side of the inverter. It is possible to connect an external brakingunit (refer to Catalog DA65.11 or DA65.10) to these terminals. The position isshown in Fig. 2-9 and Fig. 2-10.The maximum cross section of connections is 50 mm², but only provided thecrimped area of cable shoes on the equipment side is provided with a heat-shrinkable sleeve. This measure is important to ensure that air gaps and creepdistances are observed.